Morphological feature of Elopidae, Champsodontidae and Hemiramphidae By: Chea Tharith Inland Fisheries Research and Development Institute, Fisheries Administration,

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Morphological feature of Elopidae, Champsodontidae and Hemiramphidae By: Chea Tharith Inland Fisheries Research and Development Institute, Fisheries Administration, Phnom Penh

Family: Elopidae Species Name:Elops sp. Sampling Location: Prapat Beach, Ranong, Thailand Fishing Gear:Push net Stage:Flexion Measurements:Body Length 29.6 mm Head Length 2.9mm ED0.4 mm SnL0.8mm PAL27.3mm BD4.5mm Counts:D: 20 A: 15 P1: finfoldP2: finfold C: 10+9Myomeres: 55+8

Pigmentation: Pigment discrete on dorsal edge of gut,few oblique streaks on myosepta of caudal peduncle, few spots on lower part of caudal fin membranes. Morphological feature: with forked caudal fin, triangle head and ribbon like body, gut long % TL. Similar families: Megalops

Elops sp.

Family: Champsodontidae Sampling Location: Andaman Sea Fishing Gear:Bongo net Stage:Flexion Measurements:Body Length4.9 mm Head Length1.5 mm ED0.3mm SnL0.6mm PAL2.5 mm BD1.8mm Counts:D: FinfoldA: Finfold P1: Finfold P2: Finfold C: 13Myomeres:

Pigmentation: Pigment along the dorsal surface of the gut and gas bladder and have some pigmentation on eye, trunk and head, one melanophores near the level of anus Morphological feature: Body moderate elongate and slende, the gut is short, PAL is 45-68% due to the large head. The gas bladder is small spherical and located above the anterior portion of gut Teeth appear in both jaws Eye is round, Have spiny ridges on the head and on the opercula Similar families: a few taxa trichonotid, creediids, some ammodytids and trichiurids)

Champsodontidae

Family: Hemiramphidae Species Name: Hyporhamplus sp. Sampling Location: Andaman sea (owner: Pitoon) Fishing Gear:Bongo net Stage:Post flexion Measurements:Body Length9.6 mm Head Length2 mm ED0.6mm SnL0.4mm PAL6.9mm BD1.1mm Counts:D: 14 A: 15 P1:13P2: C:15Myomeres: 30+20

Pigmentation: Discreted longitudinal rows of malanophores on dorsally and ventrally portion, on the dorsal surface of the head and opercule, ventral surface of the gut and later on caudal fin rays Morphological feature: Larvae are elongate, gut reach to about three quarter of BL. The inially ovate head become increase elongate Snout length constant but the lower jaw increase There is no head spination The eye is slighly elongate. Similar families: Scomberesocid (62-70) more compress boy and their dorsal and anal finlets. Belonids generally have myomere counts and better developed eye lappers. Laevae of exocoetid genus Oxyporhamphus very similar, but fin and scal development, and lower jaw always less tham 20%.

Hyporhamplus sp.